apple installation from El capitan does not work

>> solution >> disable wlan and make sure to set the time to year 2015,
the reason for this is since there are some run out security certificates
>> in terminal enter command:
>> date 010106002015
(this should set the time to 06:00h, 01.01.2015)

see also
https://communities.apple.com/de/thread/251082331

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